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> That's because any such forcing prevents people from acting on their own best judgement

That is not how societies work, if you believe Hydrogen cyanide is the best thing to paint your house that doesn't mean you are allowed to do it; it doesn't matter if you realize or not how poisonous it is.

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Hydrogen Cyanide is actually a colorless liquid that would evaporate in the sunlight. You may be looking for Prussian blue, which has got a lovely blue color, but isn't very toxic.

Anyway, this is orthogonal to the effectivity of your analogy, but I thought you may want to know.

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